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Just after midnight Sunday, the St. Louis Fire Department responded to a fire at the intersection of N. Lenor K. Sullivan and Biddle just north of the Arch.

Schwan called 911 and says the experience rattled his nerves.

"If no one else was down there they would've been toasted," said Schwan. "Knowing they're alive makes me feel a lot better. But still, that voice that I heard is the thing that's going to resonate with me for a while."

Upon arrival, firefighters rescued two people trapped inside of the engulfed warehouse. Firefighters believe the two people were trying to get out of the cold, and possibly had a makeshift stove.

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

01/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

02/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

03/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

04/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

05/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

06/06

<p>St. Louis firefighters try to decide how to de-ice the front of Hook and Ladder 2 while water is sprayed on a six story high warehouse in eight dregree temperatures in St. Louis on December 18, 2016. Photo by Bill Greenblatt/UPI</p>

Visible fire and heavy smoke were seen throughout the entirety of the abandoned warehouse as firefighters fought to put out the flames.

St. Louis Fire Chief Dennis Jenkerson said the old building was once used as a cold storage facility. He says it's lined with cork that burns slowly and it could continue to smolder for quite a while.

The building smoldered for more than 24 hours before the fire was completely extinguished.

During the rescue, one responding firefighter was reportedly injured. They were later treated and released.